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4(4x+5)=21x+16-5x+4
We simplify the equation to the form, which is simple to understand
4(4x+5)=21x+16-5x+4
Reorder the terms in parentheses
+(+16x+20)=21x+16-5x+4
Remove unnecessary parentheses
+16x+20=+21x+16-5x+4
We move all terms containing x to the left and all other terms to the right.
+16x-21x+5x=+16+4-20
We simplify left and right side of the equation.
0x=0
0=0
This equation is an identity, so all real numbers are solutions.
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